Mounting for ring-knives for paring or splitting leather.



P. W. MERKLE.

MOUNTNG FR RING KNIVES FOR PARING 0R SPLITYING LEATHER.

' APPLICATION HLED 1350,30. 1913.

LMEMQQ., meme@ Jau. u, 1916.

come this difficulty,

'unirse srarns rafrnnr carica.

IPAUL W. MERKLE, OF LONDON, ENGLAND.

MOUNTING FOR RING-KNIVES :MSR

To all whom t mag/concern.'

specification. V n

In machines for paring and, splitting leather, the' so-called ring knives are used almost universally, in place of the old plane disk knives, that is, knives with a retracted foundation and a projecting ringvformed, cutting part.- These knives have the advantage that it is possible to often sharpen and use them, without changinggthe diameter, the speed of cutting, or the position of the knife-carrying shaft.' However, such al knife is a sensitive part of the ina-chine. It must be perfectly seated upon the knifecarrying shaft and revolve perfectly, and be easily replaced at the same time. A

The perfect fitting and revolution of the knife, together with ease of replacing, have already been attained, as-the cutting part of the knife and the 4strong walled foundation part have been made of one piece, and this one-piece knife has been adjusted to a flange of the knife-carrying shaft by means of a central boring, and then been fastened with several screws. This means of fastening fulfilled the requirement, it is true, with respect to an accurate and secure fastening, but still fhad aA defect, due to the nature of its operation. The screws had to be unfastened by meansof a screw-key, for replacing the knife. In the manipulation -with the screw-key the edge of the knife was easily injured or kthe hands of the operator were cut. The changing of the knife was, there-A fore, a delicate and dangerous operation.

The present invention is designed to overand toprovide for a of mounting and diswitljout any injury -to rapid and safe means the sharp edge.

It consists essentially of means for press-- ing the knife against thefiang of the knife-J carrying shaft, which means are removed or brought into action by' means at theend.

of the driving shaftl opposite. to the end carrying the knife.

The following'drawings and description show one embodiment of my invention.

The drawing shows a section through the diameter of the knife-carrying shaft.

Specification of Letters Patent.

Patented Jan. iii, i916.

Application filed December 30, 1913. Serial No. 809,463.

lhe ring-knife a has a cylindrical boring b in its thick-walled foundation, which is concentric with respect to the cutting edge of the knife, and is keyed thereby to the cylindrical central flangev c of the hollow knife-carrying shaft d. The shaft Z is piaced in a Suitable journal 7" in the fiame of the machine, as for example, between the table plates g. It is preferable to not join the driving pulley lz, (and other pulleys 1I for actuating specialsparts of the machine) directlyto. the knife-carrying vshaft d, but to a special driving shaft it', which is nonrigidly connected to the knife-carrying shaft ai, and drives it by means of the ,pin coupling Z.

A plate g serves to grip the knife to the flange ev of the shaft (Z, which has a pin-like projection-r, which naturally need not be Vmade in one piecewith the plate g, which projection r fits into a corresponding boring or a radial slit of the knife foundation and the flange e.. The plate g has an internal threading into which the screw bolt m in the hollow knife-carrying shaft CZ can be secured. The bolt m is fastened with a hoop 4or the like against that end of the shaft d .that is` away from the knife, and is extended and led out to aneasily accessible position in the machine to end in a 'head p, as for eX- a-mple, byV an extension n secured thereto, and jointed or linked at 0. In 'the embodiment illustrated,the partJ n, of the vbolt m lies in the hollow driving shaft le.

To secure the knife to theshaft ci, the knife is thrust together -with the plate g onto the cylindrical head o' of the ange e,

so that the pin r of the plate g prevents the plate g and the knife from revolving. rIhen the knife'is mounted by simply tightening the bolt fm by means of the head p, so that the threadings of 'the bolt m are scijewod into the iplate g. If desired, the part 'n of the bolt anvcould be 4keyed thereto at the coupling o, .so that, after the plate Q had been gripped by means of the .bolt m, the part n could be remove 'f1 om the machine,

,and keyed again to loose the plate g, but 4 this l"would somewhat, flessen the ease 'of manipulation 4of 'thesliaounting Having described my". invention, what I desire to secure by Letters Patent is l. In machines for paring -and 4splitting leather, the combination of a ring knife, and means for' fastening said knife to its shaft, comprising a fastening member and esV controlling means capable of attachment to said fastening member, said controlling means being capable of manipulation outhollow shaft and capable of manipulationbehind the ring knife, and means for engaging said bolt and said ring knife to fasten said ring knife to said flange.

4. In a' machine for cutting and paring leather, the combination o-f a ring knife having a boring, a hollow shaft having a flange on which said ring knife is mounted, a plate capable of being placed on the foundation plate of said ring knife within the hollow thereof, and a bolt lying in said hollow shaft and capable of projecting through said boring of4 the ring knife, said first-mentioned plate and said bolt being constructed for interengagement to fasten said ring knife to said flange.

5. In a machine for cutting and paring leather, the combination of a ring knife, a shaft having a flange, a plate capable of being placed on the 'foundation plate of said ring knife within the hollow thereof, a fastening member for fastening said plate to said ring knife, means for fastening said foundation plate and said shaftat a plurality of points, whereby the ring knife is Yisecured against revolution and radial move- Iment on theshaft, and means for manipulating said. fastening member located outside the hollow of the knife.

6. In a machine for cutting and paring leather, the combination of a ring knife Copies of this patent may be obtained f or :five cents each, by addressing the Commissioner of Patents,

having a central boring, a hollow shaft for carrying Said ring knife and having a flange for engaging said ring knife, a plate capable of being placed on the foundation plate of the knife within the hollow thereof, said plate having a projection passing throug a boring in the foundation plate and through a recess in the said flange of said shaft, a bolt lying in the hollow of saidl shaft and capable of'passing through the central boring of the ring-knife, said firstmentioned plate and said bolt being constructed for interengagement to fasten saidring knife to said shaft, and means for -n'ianipulatin'g 'said bolt, behind said ringknife. A

7. In a machine for cutting and paring leather, a ring knife mounted on a hollow shaft, a bolt in the hollow of said shaft, means for engaging said bolt and said ring knife for fastening said ring-knife to said shaft, and a manipulating extension on said bolt for engaging and dise-ngaging said bolt from said means, said manipulating extension projecting through that end of the .shaft removed from the ring knife. Y,

S. In a machine for cutting and paring leather, a ring knife having a back with a central opening therein, a member engaging the back of the ring knife at on-e side thereof, a second member engaging the back of the ring knife at the other side thereof, an extension on the first member, an extension on the second member, one of lsaid extensions alongside the other, and both extending away from the knife, and means away from the knife on one of the extensions for moving one member from .the othery to release the knife from between the members. In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

` PAUL W. MERKLE.

Witnesses: TRACY LAY,

O. J. IVORTH.

Washington, 1'). C. 

